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A hollow fiber gas separation composite membrane and its preparation method

A gas separation and composite membrane technology, which can be used in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., and can solve the problem of difficulty in fully exerting the transport function of carbon nanotube molecular channels.

Active Publication Date: 2020-10-27
中国人民解放军火箭军工程设计研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Whether adding carbon nanotubes to organic polymer membranes or using carbon nanotubes to directly prepare hollow fiber membranes, carbon nanotubes are in a random and disordered state, and it is difficult to give full play to the transport function of carbon nanotube molecular channels.

Method used

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  • A hollow fiber gas separation composite membrane and its preparation method
  • A hollow fiber gas separation composite membrane and its preparation method
  • A hollow fiber gas separation composite membrane and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment provides a kind of preparation method that contains 1% (wt) oriented carbon nanotube hollow fiber membrane, and the operation process is as follows figure 1 As shown, the specific steps are as follows:

[0043] (1) Disperse 0.1g carboxylated multi-walled carbon nanotubes in 80g N-N dimethylacetamide under ultrasonic treatment, disperse evenly after ultrasonic 2h, add 18.9g polyethersulfone (mass average molecular weight 50000) and 1g polyethylene glycol (mass average molecular weight 2000), after stirring for 5h, a uniform casting solution is formed;

[0044] (2) Pour the casting solution into the still of the spinning machine, seal the still of the spinning machine, heat the still of the spinning machine so that the temperature of the spinning material solution is at 20°C, and perform a vacuum degassing treatment for 30 minutes. After the degassing treatment of the spinning material liquid, open the outlet switch of the kettle, feed nitrogen into the k...

Embodiment 2-4

[0048] Only change the content of modified carbon nanotubes to 0.05%, 0.2% and 0.5%, and the consumption of polyethersulfone becomes 18.95g, 18.8g, 18.5g accordingly, other operation is the same as embodiment 1, the obtained aligned carbon nanotubes The average densities were 1.1, 2.7, and 4.8 per square micron, respectively. The gas separation characteristics of the obtained hollow fiber composite membranes were measured, and the results are shown in Table 1.

Embodiment 5

[0050] The implementation is the same as in Example 1, only the type of carbon nanotubes is changed, and single-walled carbon nanotubes are selected for use. The density of the obtained oriented carbon nanotubes is respectively averaged at 2.7 per square micron, and the gas separation of the obtained hollow fiber composite membrane is measured. properties, and the results are shown in Table 1.

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Abstract

The invention firstly provides a hollow fiber gas separation composite membrane and a preparation method thereof. The composite membrane comprises a bottom membrane formed by a hollow fiber membrane and a compact layer covering the bottom membrane. The bottom film contains modified carbon nanotubes, orientated carbon nanotubes are exposed on the surface in contact with the compact layer through plasma or wet etching, one ends of the orientated carbon nanotubes are buried in the bottom membrane, and the other ends of the orientated carbon nanotubes extend into the compact layer. Part of the oriented carbon nanotubes in the composite membrane are buried in the bottom membrane, and the other part of the oriented carbon nanotubes extend into the compact layer, so that the effect of improving the binding force between the two layers is achieved, oriented arrangement of the carbon nanotubes in the membrane material can be realized, and the separation performance of the composite membrane ofthe hollow fiber membrane is remarkably improved.

Description

technical field [0001] The invention relates to the technical fields of preparation of nanocomposite materials and separation membranes, in particular to a preparation method containing oriented carbon nanotubes and the preparation method thereof. Background technique [0002] Membrane separation is a separation process based on the principle of sieving and driven by pressure. With compact structure and efficient separation performance, membrane separation technology has been widely used in gas separation. Because of its fiber-like shape, hollow fiber membranes have the characteristics of large specific surface area, high separation efficiency, simple structure, and easy cleaning. They can be used as bottom membranes to prepare denser gas separation composite membranes. Hollow fiber gas separation composite membranes have problems such as low permeability, low selectivity, poor mechanical stability, and prone to broken filaments during use. [0003] Carbon nanotubes have n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D69/12B01D69/08B01D69/02B01D67/00B01D53/22
CPCB01D53/228B01D67/0079B01D69/02B01D69/08B01D69/12B01D71/021B01D71/68
Inventor 赵海洋张林何明清刘晓芳李会爽
Owner 中国人民解放军火箭军工程设计研究院
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